Cementos portland blancos que contienen óxido de bario
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Materials Literature
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Influencia de la temperatura de cocción y de la estructura cristalina sobre las propiedades hidráulicas de los minerales del clínker
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Aclaraciones sobre compactación, compactibilidad y los ensayos de proctor
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Bibliografía
Bóveda económica
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El revestimiento refractario en la industria del cemento
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Optical Phonon Effects in the Infra-red Spectrum of Acceptor Centres in Semiconducting Diamond
The infra-red absorption spectrum of two natural Type IIb semi-conducting diamonds has been measured by high resolution grating spectroscopy in the range 0.1 to 0.7 eV and at temperatures from 70° to 293 °K. The various absorption features (observed in much greater detail at low temperature than hitherto) were as foll…
Fábrica de cementos portland, en La Robla (León)
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Marcha del horno vertical en Australia
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Consideraciones prácticas en el bombeo de pastas crudas para fabricación de cemento
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The infrared spectra of crystalline polysaccharides. VIII. Xylans
Abstract Oriented films of 4‐ O ‐methylglucuronoxylan from several sources were prepared by hot stretching acetyl derivatives. The resulting oriented samples could be converted to crystalline xylans without destroying the orientation. Infrared spectra of the oriented samples were recorded using polarized radiation. Ba…
Crack-Tip, Stress-Intensity Factors for Plane Extension and Plate Bending Problems
A complex variable method for evaluating the strength of stress singularities at crack tips in plane problems and plate bending problems is derived. The results of these evaluations give Irwin’s stress-intensity factors for plane problems and analogous quantities for bending problems, a form familiar to the practition…
Far Infrared Dielectric Dispersion in BaTiO3, SrTiO3, and TiO2
The room temperature reflectivity of BaTi${\mathrm{O}}_{3}$, SrTi${\mathrm{O}}_{3}$, and Ti${\mathrm{O}}_{2}$ has been measured from 5000 to 70 ${\mathrm{cm}}^{\ensuremath{-}1}$. These data have been analyzed by the Kramers-Kronig method and by classical dispersion theory. All of the infrared-active fundamental vibrat…
Mössbauer Spectra of Some Iron Complexes
Mössbauer spectra were obtained for the following coordination compounds: iron phthalocyanine, ferrocene, iron carbonyl, iron III acetylacetonate, and iron II acetylacetonate dipyridine; for the following complex ion salts iron II trisphenanthroline chloride, iron III EDTA (monosodium salt), iron II EDTA, hemin, ferri…
Extrapolation of the Orthorhombic n-Paraffin Melting Properties to Very Long Chain Lengths
An analysis of the equation TM=T0 (n+a) / (n+b) is made in order to determine the convergence temperature T0 of the melting temperatures of the n-paraffins from C44 to C100. A good fit is obtained using T0=414.3°K, a=—1.5, and b=5.0. This value of T0 (414.3°K=141.1°C) has an estimated total uncertainty of ±2.4°K and i…
Diffraction contrast of electron microscope images of crystal lattice defects. III. Results and experimental confirmation of the dynamical theory of dislocation image contrast
Abstract Numerical solutions for the transmitted and diffracted wave intensities when electrons pass through a thin foil containing a dislocation, are obtained by the use of a previously derived formulation of dynamical diffraction theory which takes account of anomalous absorption effects. The results for a variety o…
Studies of the Movement of Wool Fibers in Fabrics During Felting
Two types of fabric, a tightly constructed worsted and a woolen of more open con struction, have been milled in laboratory stocks. Curves of (i) shrinkage in both warp and weft directions, as a function of time, and (ii) the mean displacement d of those fiber portions which have moved, also as a function of time, have…
THE SULPHURIC ACID SOLVENT SYSTEM: PART III. THE PREPARATION AND STRUCTURES OF SOME COMPLEX SULPHATOBORATES
By neutralizing sulphuric acid solutions of tetra(hydrogensulphato)boric acid with various metal hydrogensulphates, sodium, potassium, ammonium, and strontium salts have been prepared. From the compositions of these salts, and from the results of cryoscopic and conductimetric measurements on their solutions in sulphur…
Cyanoethyl and aminopropyl ethers of polyvinyl alcohol
Abstract The presence of free hydroxyls in polyvinyl alcohol presents a multitude of opportunities for changing the properties of this polymer, a fact which is of considerable theoretical and practical interest. The results are presented of a study of the incorporation of nitrile and amino groups in polyvinyl alcohol.…
Sorption of Anhydrous Ammonia by Dry Clay Systems
Abstract NH 3 sorption and/or retention over the pressure range of 0 to 100 ml. of mercury by dry bentonite, halloysite, and synthetic gibbsite was investigated using a manometric technique employing equilibrium measurements in a special sorption apparatus. Chemisorbed NH 3 is believed to be that which has gained a pr…